Driving mechanism for cylinders



March 8, 1968 R. SCHWARZ DRIVING MECHANISM FOR CYLINDERS 5 Sheets-Sheet1 Filed April 27, 1964 March 8, 1966 R. SCHWARZ 3,233,801

DRIVING MECHANISM FOR CYLINDERS Filed April 27, 1964 5 Sheets-Sheet 2March 8, 1966 Filed April 27, 1964 Fig.

R. SCHWARZ DRIVING MECHANISM FOR CYLINDERS 5 Sheets-Sheet 3 March 8,1966 R. SCHWARZ DRIVING MECHANISM FOR CYLINDERS 5 Sheets-Sheet 4 FiledApril 27, 1964 March 8, 1966 R. SCHWARZ DRIVING MECHANISM FOR CYLINDERS5 Sheets-Sheet 5 Filed April 27, 1964 United States Patent 3,238,801DRIVING MECHANISM FOR CYLINDERS Rudolf Schwarz, Horgen, Switzerland,assignor to Gebruder Staubli & C0., Horgen, Switzerland Filed Apr. 27,1964, Ser. No. 363,683 Claims priority, application Switzerland, Apr.26, 1963, 5,253/ 63 8 Claims. (Cl. 74-151) The invention concerns adriving mechanism for imparting stepped advance movements to a rotatablecylinder shaft from a continuously rotating drive shaft, the preferreduse of the mechanism being in dobbies with a cylinder for paper cards,or lag and pegs, or iron rollers.

The control of dobbies is provided by means of striplike control cardsprovided with pins or with punched holes so as to be able to read offdata when using the latter, in the control process the cards must stopexactly at the predetermined spot, as this makes it possible for thereading needle to fall unhindered into the holes.

The stepped advance of the cylinder shaft takes place in the known wayby crank shaft and eccentric, by means of a worm gearing or by a pindisposed on a rotating disc, which on each rotation engages a tooth of atoothed wheel on the cylinder shaft and carries this along to the extentof at least one toothing. With these known devices, the stepped turningof the cylinder is jerky. With each engagement of the forwardingmechanism there is brusque movement which leads to great wear and tearand to undesirable vibrations.

With the new driving mechanism, there is a smoother passing over fromstandstill to the advance movement in that the operational diagram showsa sinusoidal curve. This mechanism has the feature that the drive shafthas a cam profile means and the cylinder shaft a toothed wheel and thatthere are disposed two bellcrank levers the first lever being piv-otableat a fixed pivot, and that one free end of this first lever is connectedto the cam means, whereas the other free end of this first lever ispivotally connected to the apex of the second lever, and that,furthermore, one free end of this second lever is connected to the samecam means and the other free end of this second lever engages thetoothed wheel.

The invention will now be described with reference to the embodiments ofthe subject-matter of the invention shown in the drawings.

FIG. 1 is a top view of the drive mechanism of the cylinder shaft.

FIG. 2 is a side view of the drive mechanism, in which the drive shaftand the cylinder shaft have the same direction of rotation.

FIG. 3 is the diagram showing the above.

FIGS. 4a, 4b, 4c and 4d are diagrammatic representations of the workpositions of the driving mechanism.

FIGS. 5a, 5b, 5c and 5d are diagrammatic representations of the drivingmechanism with counterrunning di rection of rotation of drive shaft andcylinder shaft.

On the drive shaft 1 there is a cam profile 2, which in FIGS. 1 and 2 isshown with grooved profile and in FIGS. 4 and 5 with cog profile. Thetoothed wheel 3 is fixed on the cylinder shaft 4. In FIGS. 4 and 5 thetoothed wheels are shown as discs.

The bellcrank lever 5, having arms 5:: and 5b, is pivotally disposed inthe fixed shaft 6, whereas the bellcrank lever 7, with arms 7a and 7b,is pivotally fixed on arm 5b at 8. The arms 5a and 5b of the lever 5form an obtuse angle, and those of the double lever 7 an acute angle.

The arms 5a and 7a each have a roller 9 or 10 which either follow thecontour of an open cam or engage in the groove of the cam 2. To enablethe other end Patented Mar. 8, 1966 of the second lever to engage in thetoothed wheel 3, a bolt 11, is provided, fixed on the arm 7b.

Essentially, the contour of the cam profile 2 consists of arcuateprofile portions A and C and the contour profile portions B and D.

The separate operations will now be described in reference to FIGS. 4a,4b, 4c and 4d. For disengaging the bolt 11 from the toothed wheel 3, thelever 5 in this representation is tilted counter-clockwise from thecontour portion D. The center of rotation 8 for the lever 7 is raisedand the bolt 11 slides out, as shown in FIG. 4a. Movement of the contourportion D then takes place, and this portion glides under the roller 10and tilts the lever 7, the lever 5 and with it also the center ofrotation 8 of the lever 7 remaining unchanged. The return of the controlbolt 11 accordingly takes place.

FIG. 4b shows the position after the return is completed. For theengagement of the bolt in the toothed wheel, the lever 7 remains inunchanged position, since the roller glides over the arcuate profileportion A. On the other hand, the contour portion B raises the roller 9,which gives pivotal movement to the lever 5 about the fixed pivot 6,whereupon the lever 7 drops and the bolt engages in the toothed wheel,as shown in FIG. 4c. The actual driving operation is effected by thecontour profile B raising the roller 10 so that the arm 7a, and with italso the arm 7b, pivots at pivot point 8.

In contrast to the embodiment described, the two shafts 1 and 4 in theembodiment of the FIGS. 5a, 5b, 5c and 5d rotate counter-clockwise. Thefirst lever 5 is here nearer to the two shafts 1 and 4 than the secondlever, or the apex of the bellcrank lever is located outside thetriangle defined by the driving axis 1, the cylinder axis 4 and thefixed pivot 6, whereas with the first described example, the secondlever is located between the two shafts 1 and 4, i.e. between the fixedpivot 6 and the shaft 4.

FIG. 5a shows the mechanism after the driving op eration and before thebolt 11 has been disengaged from the toothed wheel 3, which takes placeby the cooperation of the contour portion D with the roller 9. Thereturn of the bolt 11 in relation to the toothed wheel takes place bythe cooperation of the contour portion D with the roller 10, that is tosay, the lever 7 is tilted, whereas the lever 5 is motionless, as can beseen by comparing FIG. 5b with FIG. 50. To engage, the roller 9 dropsover the contour portion B, whereas the roller 10 rolls over the arcuateportion C, the lever 7 remaining motionless. When the lever 10 rollsover the contour part B, as can be seen by comparing FIG. 5d with FIG.5a the lever 7 pivots, and the actual driving operation at the toothedwheel 3 takes place with the pivot point 8 motionless, since the roller9 glides over the arcuate portion A.

From the details of functioning given, it can be seen that whilst acontour portion B, D cooperates with an arm or its roller, the other armor its roller always engages with an arcuate profile portion A, C, sothat duplicated movements of the levers are excluded, that is to sayeach lever carries out a movement which is exactly planned for it alone.

The device permits a smooth, that is to say not jerky transfer from oneposition to the other. FIG. 3 shows the sinusoidal-like forward movementof the toothed wheel and, accordingly, of the cylinder shaft with itscontrolled card.

I claim:

1. A driving mechanism for imparting stepped advance movements to arotatable cylinder shaft from a continuously rotating drive shaft, whichincludes cam profile means secured to said drive shaft, a toothed wheelsecured to said cylinder shaft, a first 'bellcrank lever, a fixed pivotfor said first lever, means connecting one free end of said first leverto said cam means whereby said free end follows the profile of the cammeans, a second bellcrank lever, means pivotally connecting the otherfree end of said first lever to the apex of the second lever, meansconnecting one free end of said second lever to said cam means wherebysaid free end follows the profile of the cam means, and means at theother free end of said second lever for engaging said toothed wheel.

2. A driving mechanism according to claim 1, wherein said meansconnecting one free end of said first and second levers to said cammeans comprise rollers mounted at said free ends.

3. A driving mechanism according to claim 1, wherein said means forengaging said toothed wheel consists of a bolt provided at said otherfree end of said second lever.

4. A driving mechanism according to claim 1, wherein the profile of thesaid cam means includes first and second arcuate profile portions andfirst and second contour profile portions, which profile portions aredisposed so that each contour portion is followed by the said one freeend of each lever when the other contour portion is not being followedby the said one free end of the other lever, whereby the said lever freeend of said second lever is caused to perform four separate movements ofstarting, lifting, return and engagement.

5. A driving mechanism according to claim 1, wherein the angle betweenthe two arms of the first lever is greater than the angle between thetwo arms of the second lever. lever.

6. A driving mechanism according to claim 1, wherein the apex of thesecond lever lies outside the triangle defined by the axis of thecylinder shaft, the axis of the drive shaft, and the said fixed pivot.

7. A driving mechanism according to claim 1, wherein the second lever islocated between the said fixed pivot and the axis of the cylinder shaft.

8. A driving mechanism which includes a drive shaft continuouslyrotating, a cylinder shaft, parallel to the said drive shaft, with atoothed wheel mounted on it, cam profile means secured to said driveshaft, first and second arcuate profile portions defined as said camprofile, and concentric with said drive shaft, first and second contourprofile portions defined on said cam profile, a first lever, meanspivotably mounting said first lever about a fixed fulcrum between itsends, means for causing one end of said first lever to follow theprofile of said cam means, a second lever, means pivotably connectingthe other end of the first lever to a point on the second lever betweenits ends, means for causing one end of said second lever to follow theprofile of said cam means at a point spaced from the end of the firstlever so that when one end of either lever is following a contourprofile portion the one end of the other lever is following an arcuateprofile portion, and means at the other free end of said second leverfor engaging said toothed wheel, the arrangement being such that thesaid other free end of said second lever is caused to perform fourseparate movements of starting, lifting, return and engagement.

References Cited by the Examiner UNITED STATES PATENTS 646,287 3/1900Hundhausen 74-144 1,383,331 7/1921 Nordstrom 74151 FOREIGN PATENTS112,443 3/ 1929 Germany.

BROUGHTON G. DURHAM, Primary Examiner.

J. A. MARSHALL, Assistant Examiner.

1. A DRIVING MECHANISM FOR IMPARTING STEPPED ADVANCE MOVEMENTS TO AROTATABLE CYLINDER SHAFT FROM A CONTINUOUSLY ROTATING DRIVE SHAFT, WHICHINCLUDES CAM PROFILE MEANS SECURED TO SAID DRIVE SHAFT, A TOOTHED WHEELSECURED TO SAID CYLINDER SHAFT, A FIRST BELLCRANK LEVER, A FIXED PIVOTFOR SAID FIRST LEVER, MEANS CONNECTING ONE FREE END OF SAID FIRST LEVERTO SAID CAM MEANS WHEREBY SAID FREE END FOLLOWS THE PROFILE OF THE CAMMEANS, A SECONE BELLCRANK LEVER, MEANS PIVOTALLY CONNECTING THE OTHERFREE END OF SAID FIRST LEVER TO THE APEX OF THE SECOND LEVER, MEANSCONNECTING ONE FREE END OF SAID SECOND LEVER TO SAID CAM MEANS WHEREBYSAID FREE END FOLLOWS THE PROFILE OF THE CAM MEANS, AND MEANS AT THEOTHER FREE END OF SAID SECOND LEVER FOR ENGAGING SAID TOOTHED WHEEL.